Answer:
12 ft
Step-by-step explanation:
The diagonal divides the flag into 2 right triangles.
Using Pythagoras' identity on the right triangle.
The square on the hypotenuse (diagonal ) is equal to the sum of the squares on the other 2 sides.
let x be the length, then
x² + 9² = 15²
x² + 81 = 225 ( subtract 81 from both sides )
x² = 144 ( take the square root of both sides )
x = [tex]\sqrt{144}[/tex] = 12
The length of the flag is 12 ft
